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c142dafdf3
First slice of the schema-lint chassis. Adds stable `OG-XXX-NNN`
codes to schema-migration rejections so operators can suppress, look
up, and filter on identifiers rather than free-text prose. Atlas-style
chassis adapted to omnigraph's typed-IR substrate (no SQL injection
vector, no per-engine locks, native edge/vector/embedding types).
What's in v0:
- New `omnigraph-compiler/src/lint/` module with:
- `diagnostic.rs` — Family / SafetyTier / Severity enums covering ten
families (DS, MF, CD, BC, NM, OW, NL, VE, ED, LK). Only DS and MF
are populated in this PR.
- `codes.rs` — 8 DiagnosticCode constants (OG-DS-101..105,
OG-MF-103, OG-MF-104, OG-MF-106). Five of the eight are wired to
real emission sites; the other three are reserved.
- Unit tests for catalog invariants: codes unique, prefix matches
family, suffixes are 3-digit, destructive defaults to error,
lookup() works, EMITTED_IN_V0 codes exist in ALL_CODES.
- `SchemaMigrationStep::UnsupportedChange` gains an optional
`code: Option<String>` field. New `unsupported_error_message()`
helper prefixes the message with `[code]` when present.
- 5 of 17 existing rejection paths now carry codes:
- `removing node type` → OG-DS-102
- `removing edge type` → OG-DS-103
- `removing property` → OG-DS-104
- `adding required property without backfill` → OG-MF-103
- `changing property type` → OG-MF-106
Remaining 12 paths carry `code: None` and are tagged as future work.
- `schema_apply` surfaces the formatted error (with `[code]` prefix);
CLI `omnigraph schema plan` renders the code on the
`unsupported change on <entity>` line.
- PR #62 destructive-rejection tests in `tests/schema_apply.rs` now
assert on the stable code (`msg.contains("OG-DS-104")`) instead of
the error-message substring. 11/11 tests pass.
- New `docs/schema-lint.md` documents the v0 catalog + the 10 families
+ Atlas prior art. AGENTS.md index updated.
What's explicitly NOT in v0 (subsequent PRs):
- No severity config in `omnigraph.yaml` (MR-694 §2).
- No `@allow(OG-XXX-NNN, "rationale")` suppression directive (§3).
- No `--allow-data-loss` flag or destructive-tier enforcement.
- No new `SchemaMigrationStep` variants (soft/hard drops, default,
widen/narrow). MR-700, MR-697 land those.
- No pre-migration checks (MR-941).
- No CD / VE / LK / NM family rules (MR-942..945).
- No CI integration (MR-946).
Tests: 235 compiler tests, 11 schema_apply integration tests, 14
lint module tests, 55 CLI tests — all green.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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